blob: fd2068f5ae1675478d6ee2edd325633581a79f7c [file] [log] [blame]
Abhijeet Joglekar5df6d732009-04-17 18:33:26 -07001/*
2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
16 * SOFTWARE.
17 */
18
19#include <linux/errno.h>
20#include <linux/types.h>
21#include <linux/pci.h>
22#include <linux/delay.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Abhijeet Joglekar5df6d732009-04-17 18:33:26 -070024#include "vnic_dev.h"
25#include "vnic_rq.h"
26
27static int vnic_rq_alloc_bufs(struct vnic_rq *rq)
28{
29 struct vnic_rq_buf *buf;
30 struct vnic_dev *vdev;
31 unsigned int i, j, count = rq->ring.desc_count;
32 unsigned int blks = VNIC_RQ_BUF_BLKS_NEEDED(count);
33
34 vdev = rq->vdev;
35
36 for (i = 0; i < blks; i++) {
37 rq->bufs[i] = kzalloc(VNIC_RQ_BUF_BLK_SZ, GFP_ATOMIC);
38 if (!rq->bufs[i]) {
39 printk(KERN_ERR "Failed to alloc rq_bufs\n");
40 return -ENOMEM;
41 }
42 }
43
44 for (i = 0; i < blks; i++) {
45 buf = rq->bufs[i];
46 for (j = 0; j < VNIC_RQ_BUF_BLK_ENTRIES; j++) {
47 buf->index = i * VNIC_RQ_BUF_BLK_ENTRIES + j;
48 buf->desc = (u8 *)rq->ring.descs +
49 rq->ring.desc_size * buf->index;
50 if (buf->index + 1 == count) {
51 buf->next = rq->bufs[0];
52 break;
53 } else if (j + 1 == VNIC_RQ_BUF_BLK_ENTRIES) {
54 buf->next = rq->bufs[i + 1];
55 } else {
56 buf->next = buf + 1;
57 buf++;
58 }
59 }
60 }
61
62 rq->to_use = rq->to_clean = rq->bufs[0];
63 rq->buf_index = 0;
64
65 return 0;
66}
67
68void vnic_rq_free(struct vnic_rq *rq)
69{
70 struct vnic_dev *vdev;
71 unsigned int i;
72
73 vdev = rq->vdev;
74
75 vnic_dev_free_desc_ring(vdev, &rq->ring);
76
77 for (i = 0; i < VNIC_RQ_BUF_BLKS_MAX; i++) {
78 kfree(rq->bufs[i]);
79 rq->bufs[i] = NULL;
80 }
81
82 rq->ctrl = NULL;
83}
84
85int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
86 unsigned int desc_count, unsigned int desc_size)
87{
88 int err;
89
90 rq->index = index;
91 rq->vdev = vdev;
92
93 rq->ctrl = vnic_dev_get_res(vdev, RES_TYPE_RQ, index);
94 if (!rq->ctrl) {
95 printk(KERN_ERR "Failed to hook RQ[%d] resource\n", index);
96 return -EINVAL;
97 }
98
99 vnic_rq_disable(rq);
100
101 err = vnic_dev_alloc_desc_ring(vdev, &rq->ring, desc_count, desc_size);
102 if (err)
103 return err;
104
105 err = vnic_rq_alloc_bufs(rq);
106 if (err) {
107 vnic_rq_free(rq);
108 return err;
109 }
110
111 return 0;
112}
113
114void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
115 unsigned int error_interrupt_enable,
116 unsigned int error_interrupt_offset)
117{
118 u64 paddr;
119 u32 fetch_index;
120
121 paddr = (u64)rq->ring.base_addr | VNIC_PADDR_TARGET;
122 writeq(paddr, &rq->ctrl->ring_base);
123 iowrite32(rq->ring.desc_count, &rq->ctrl->ring_size);
124 iowrite32(cq_index, &rq->ctrl->cq_index);
125 iowrite32(error_interrupt_enable, &rq->ctrl->error_interrupt_enable);
126 iowrite32(error_interrupt_offset, &rq->ctrl->error_interrupt_offset);
127 iowrite32(0, &rq->ctrl->dropped_packet_count);
128 iowrite32(0, &rq->ctrl->error_status);
129
130 /* Use current fetch_index as the ring starting point */
131 fetch_index = ioread32(&rq->ctrl->fetch_index);
132 rq->to_use = rq->to_clean =
133 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
134 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
135 iowrite32(fetch_index, &rq->ctrl->posted_index);
136
137 rq->buf_index = 0;
138}
139
140unsigned int vnic_rq_error_status(struct vnic_rq *rq)
141{
142 return ioread32(&rq->ctrl->error_status);
143}
144
145void vnic_rq_enable(struct vnic_rq *rq)
146{
147 iowrite32(1, &rq->ctrl->enable);
148}
149
150int vnic_rq_disable(struct vnic_rq *rq)
151{
152 unsigned int wait;
153
154 iowrite32(0, &rq->ctrl->enable);
155
156 /* Wait for HW to ACK disable request */
157 for (wait = 0; wait < 100; wait++) {
158 if (!(ioread32(&rq->ctrl->running)))
159 return 0;
160 udelay(1);
161 }
162
163 printk(KERN_ERR "Failed to disable RQ[%d]\n", rq->index);
164
165 return -ETIMEDOUT;
166}
167
168void vnic_rq_clean(struct vnic_rq *rq,
169 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf))
170{
171 struct vnic_rq_buf *buf;
172 u32 fetch_index;
173
174 BUG_ON(ioread32(&rq->ctrl->enable));
175
176 buf = rq->to_clean;
177
178 while (vnic_rq_desc_used(rq) > 0) {
179
180 (*buf_clean)(rq, buf);
181
182 buf = rq->to_clean = buf->next;
183 rq->ring.desc_avail++;
184 }
185
186 /* Use current fetch_index as the ring starting point */
187 fetch_index = ioread32(&rq->ctrl->fetch_index);
188 rq->to_use = rq->to_clean =
189 &rq->bufs[fetch_index / VNIC_RQ_BUF_BLK_ENTRIES]
190 [fetch_index % VNIC_RQ_BUF_BLK_ENTRIES];
191 iowrite32(fetch_index, &rq->ctrl->posted_index);
192
193 rq->buf_index = 0;
194
195 vnic_dev_clear_desc_ring(&rq->ring);
196}
197